maclean



(No Model.) 3 Sheets--Sheet 1. 0. W. MAOLEAN.

HOISTING DEVICE.

No. 465,869. Patented Dec. 29, 1891;

WITNESSES: INVENTOR ATTORNEYS TH: Moms PETERS cu, pnofo-Llmm,WASHINGTON, n. c.

(N0 Modei.) 3 Sheets-Sheet 2. O. W. MAOLEAN.

HOISTING DEVICE.

Patented 1390.29, 1891.

5 I 5 av WITNESSES.- /NVENTOH Wm v 5% fizb wa /W1 BY ATTORNEYS UNITEDSTATES PATENT OFFICE.

CHARLES XVILLIAMMAOLEAN, OF MELBOURNE, VICTORIA.

HOISTING DEVICE.

SPECIFICATION forming part of Letters Patent No. 465,869, dated December29, 1891.

Application filed January 9, 1891. derial No. 377,267. (lilo model.)Patented in Victoria April 26, 1890, No. 7,673; in New fiouth WalesApril 29, 1890, No. 2,166.

To aZZ whom it may concern:

Be it known that I, CHARLES WILLIAM MACLEAN, engineer, a subject of theQueen of Great Britain, residing at 276 Walsh Street, South Yarra,Melbourne, in the British Colony of Victoria, have invented ImprovedHoistiug Devices, (for which I have obtained Letters Patent in thefollowing British colonies, viz: Victoria, patent dated April 26, 1890,No. 7,673, and New South \Vales, patent dated April 29, 1890, No.2,166,) of which the following is a specification.

This invention has been devised primarily for the purpose of dispensingwith the usual counterbalance-weight employed in taking up the slack ofthe opening-chain of grab-cranes.

Itconsists in certain hereinafter-described means whereby the mainhoisting-drum and the opening-drum used for operating the grab may beconnected to each other during the greater part of their travel and yetbe disconnected whenever it becomes desirable for one of said drums tocontinue to rotate for any predetermined number of revolutions for thepurpose of either slackening out or winding up either or both of thechains used for hoisting and opening the grab.

My invention is, ble for-connecting any rotating objects in the sameaxial line which are required to revolve simultaneously at times, and attimes required to revolve independently of each other for a limitedperiod-say one or more revolutions or a part of a revolution.

My invention consists, essentially, in the employment of one or morerings or collars fitting loosely upon the shaft upon which the twoobjects to be coupled are mounted, and each provided with a stop,shoulder, or abutment-such, for instance, as a radially-projecting armor lug or a pair of teeth projecting from its faces and adapted toengage with other teeth or projections on the adjacent faces of the tworotating objects, as will be well understood from the followingdescription, reference being had to my drawings, wherein- Figures 1 to15 are views illustrating various modifications of my invention. Figs.16

to 21 are views illustrating the application of my invention to thehoisting and opening however, equally applica-' gearof a grab-crane. Ofthese diderent views Fig. 1 is a central vertical section of one of thesimplestforms of my invention. Fig. 2 is a vertical transverse sectionon the line 2 2 in Fig. 1; and Figs. 3 and 4 are respectively a sideelevation and an edge view of one of the essential features of myinvention-that is, of a ring or collar adapted to fit loosely 011 theshaft or axle or on one of the shafts or axles upon which the tworotating objects to be coupled are moun ted. This collar is providedwith a radially-projecting arm or lug.

Similar letters of reference indicate the same or corresponding parts inall the figures. A B represent two disks, one of which A may be calledthe driver and the other B the driven disk. These are mounted upon ashaft or axle C, and are supposed to be either connected With or else toform part of two rotating objects which it is desired to connecttogether in the manner above describedthat is, so that after rotatingtogether for a time the disk B may bepermitted to continue its rotationfor a partor the Whole of a revolution or for any required number ofrevolutions,while the driving-disk A may be stopped; or, vice versa, thedriven disk B. may be stopped and the driving-disk A may be rotated forone or more revolutions or a part of a revolution in a reversedirection. Between these two disks A B and upon the same shaft 0 isloosely mounted a ring or collar D, having a radially-projecting arm orlug (Z, adapted to be engaged by suitable stops, shoulders, or abutmentson said disks, such stops consisting in this construction of pins orstuds d and (Z projecting from the adjacent faces of the said disks-ABto serve as a connection between them, so that if, for instance, the onemarked A is caused to revolve in a certain direction it will carry theother one B with it. If it is desired to stop the disk A at any point,the other one will be free to continue its motion for nearly tworevolutions-that is, until the pin (2 has traveled round once, as shownby the arrow 1 in Fig. 2, and engaged with the arm or lug d, and thencarried said arm round until the latter engages with the pin d, asindicated by the arrow 2 in said figure, whereby of course any furthermovement will be pre vented unless the disk A is again released. Viceversa, the disk A may be reversed at any time under the aboveconditionsthat is. until the pin cl has carried the arm d round from oneto the other side of the tooth (1 If another collar D and arm or lugdhaving an outwardly-projecting tooth or projection (l on its face, asillustrated in Figs. 3 and 4, are mounted upon the spindle O alongsidethe first-mentioned arm (1, as illustrated in Figs. 5 and 6, then thetwo disks A and B will each be free to rotate independently duringnearly three revolutions. Still greater freedom of independent rotationmay be obtained by mounting additional toothed arms (Z between the disksA and B, as will be well understood, the only proviso being that the pinor projection d on the disk B must be free to pass the pin or projection61 on the next arm but one, as illustrated in Figs. 5 and 6.

Another form of my invention is shown in Figs. 7 and 8. Thismodification .has been devised for use in situations where it isdesirable to keep the diameter of the coupling appliances or adjustableconnections as small as possible. Of these two views Fig. 7 is avertical central longitudinal section of the adjacent ends of tworotating objects provided with my improved means foradjustablyconnecting them, while Fig. 8 is a verticalv transversesection on line 8 8, Fig. 7. In these two figures A B represent theadjacent endsof apair of rotating barrels mounted upon a common shaft oraxle O and formed each with an annular recess in its end, in each ofwhich recessesisprovidedaproj ection or tooth d d which is adapted to beengaged by the teeth or projections d on aloosely-fitting ring or collarD,which is mounted upon the shaft 0 between the two adjacent ends of thebarrels A B, as clearly illustrated in said Figs. 7 and 8. Theconstruction of this interposed toothed ring or collar D is clearlyillustrated in Figs. 9, 10, and 11, and its operation is precisely thesame as that of the arm or lug din Figs. 1 and 2. If it is desired toincrease the independent freedom of rotation of the two barrels A B, asecond toothed ring D may be interposed between them, as illustrated inFigs. 12 and 13, in order to obtain a similar result to thatobtained byinterposing the duplicate ring D in Figs. 5 and 0, and of course thenumber of such interposed toothed rings may be increased to any desiredextent according to the number of revolutions during which it is desiredto leave the two rotating objects free of each other.

The arrangement illustratedin Figs. ll and 15 is substantially the sameas that illustrated in Figs. 5 and 6, except that projecting stops (1 dare used instead of pins d d This arrangement will be understood fromtheletters of reference without further description.

Having now described and ascertained the nature of my invention, Iwillproceed, byway of example, to describe its application to the Operatingmechanism of an ordinary grabcrane, whereby its application to otherdescriptions of mechanism of a similar character will be wellunderstood.

Fig.16 is a longitudinal section of a pair of barrels or drums such asare commonly used for hoisting and opening grabs and to which myinvention has been applied. Fig. 17 1s an end elevation of one of suchbarrels or drums. Fig. 18is a front elevation of the toothed ringemployed in adj ustably connectingsuch barrels or drums according to myinvention.

Fig. 19 is a vertical transverse section on line 19 19, Fig. 18.

Figs. 20 and 21 are respectively a side elevation and a front elevationof a grab-crane having'a bucket operated by a pair of barrels adjustablyconnected by my invention.

Fig. 22 is a longitudinal section showing the way in which my inventionmay be applied for connecting two parallel barrels, Fig. 23 being atransverse section on the line 23 23.

A represents the barrel for closing and hoisting the grab, E adriving-wheel which can either be put into gear with some source ofmotive power or can be stopped and held by means of a suitably-arrangedbrake F, as in Fig. 20, while 13 represents the grab-opening barrelwhich is also provided with a brakewheel e, whereby its rotation may bestopped at will. According to my invention I construct the adjacent endsof these two barrels A and B as illustratedin Figs. 16 and 17-that is,with recesses provided each with a tooth or projection d or d ashereinbefore described with reference to Figs. 7 and 8. Within theserecessed ends of said barrels one or more toothed rings D are looselymounted upon the shaft 0 in such a manner that their teeth 'orprojections d will be' caused to engage with the teeth d d in the endsof the barrels A and B when one of them is rotated, as has hereinbeforebeen described with reference to said Figs. 7 and 8.

\Vhen employing my invention, the end of the grab-opening chain H ismade fast to the barrel B instead of being led over pulleys and sheavesand having a counterbalanceweight upon its end, as has hitherto usuallybeen the case.

The operation of a grabcrane, such as is illustrated in Fig. 20, whenprovided with my improved means for adjustably connecting its closingand hoisting and opening barrels is as follows: Assuming the grab Itohave been closed and to be in the act of being hoisted by the chain orrope J being wound upon the barrel A then the grab-opening chainH willbe in a slack condition and will be wound upon the barrel B at the samerate as said hoisting-chain J is wound upon its barrel, because bothbarrels are during'this part of the operation connected through themedium of the stops and shoulders and the arms hereinbeforedescribed-that is, the hoisting-barrel A is driving the opening-barrelB. When itis desired to open the grab,

the barrel B is stopped by means of a brake acting upon itsbrake-wl1eel, and the barrel A is released from its driving-gear and isallowed to run backward, thus transferring the weight of the grab ontothe opening-chain and so discharging the contents of the grab. In orderto lower the grab, the brake acting upon the wheel 6 of the barrel B isslightly released, thus lowering the open grab and allowing theclosing-chain J to run out freely from off the barrel A. The grab havingdropped onto the spoil the brakewheel e is released, thus leaving thebarrel B free. The barrel A is then caused to rotate and winds up theclosing and hoisting chain J, the barrel B meanwhile being disconnectedfrom the barrel A until the grab is closed, when it also begins torotate with the barrel A and winds in the opening-chain H as the grabrises.

In Fig. 22 the drums A and B instead of be i ng carried by the sameshaft, are keyed on two shafts c and 0, arranged parallel with oneanother. These shafts are connected by two spur-wheels G and G. Thespur-wheel G is mounted to rotate on the shaft 0, the spurwheel G beingkeyed to the shaft 0. The independent rotation of the spur-wheel G onthe shaft 0 is controlled by collars D,furnished with arms (Z, engagingwith stops (1 and d, Fig. 23, in the manner previously described.

The stop cl is formed on a flanged disk G keyed on the shaft 0. By thesemeans the driving-shaft c canrotate for nearly three revolutions, whilethe driven shaft 0 remains stationary, or vice versa.

I wish it to be understood that the above description of the applicationof my invention to mechanism for operating a grab is g ven merely by'wayof example, it being obvious that it might be applied in manydi'flferent ways, while, as hereinbefore stated, it is equallyapplicable to all classes of machinery wherein two rotating objects inthe same axial line are required to be adj ustably connected, ashereinbefore described.

Having now particularly described and as certained thenature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. The combination, with the rotary parts A and B,carrying pins or stops (1 and d2, of rings or collars D, each furnishedwith an arm cl, and one of said arms being provided with a pin (1substantially as and forthe purposes set forth.

2. In a hoisting device, the combination, with the rotary parts A and B,furnished with stops, of a plurality of loosely-fitting rings D, havingstops, substantially as and for the purposes set forth.

OHARLES WILLIAM MACLEAN.

Witnesses:

WALTER SMYTHE BAYSTON, WALTER CHARLES HART.

